71
Fig. 39
Fig. 40
The crimper can also be used to grip the vials to transfer them to the hot oven or to remove the hot vials from
the oven
The vials can be very hot depending on the bakeout temperature and must be handled with
appropriate care!
3.1.2
The 0
– Vial
A 0-vial is a dry-titrated vial that is used for conditioning the entire system including the oven. This principle is
analogous to conditioning when working with a TitroLine
®
7500 KF
trace
without an oven. For the determination,
a fresh, empty vial is placed in the oven and conditioned until a constant drift is measured and the start
parameters are met. This vial can be used several times. If the start drift is no longer achieved, the 0-Vial must be
changed.
The start drift of the system determined in this way is carried out at the beginning of a measurement. The starting
conditions are defined in the method parameters.
3.1.3
The blank measurement
Before each sample titration, a blank measurement of the vials is required. This determines how much water is
present in the air volume of the vial which is included in the sample measurement. To determine the blank,
several blank vials are measured. At least three measurements are recommended. While the samples are
weighed, the vials intended for blank measurement are placed near the balance and closed at the same time as
the sample vials. The water content is determined before the actual sample measurement. The mean value from
the multiple measurement is stored in µg water on a global variable. In the method parameters of the sample
method, this global variable is subtracted from the result of the sample titration in the formula for calculating the
water concentration.
On the subject of global variables and formula editor, see also TitroLine
®
7500 KF
trace
.